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From "Adam Kramer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6592) Scheduler: Pause button desirable
Date Tue, 23 Feb 2010 06:49:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837107#action_12837107
] 

Adam Kramer commented on HADOOP-6592:
-------------------------------------

Nearly. If there's a bunch of "very low" priority tasks, they will still vie for resources.
Similarly, if I want to pause my task because I _expect_ other tasks to arrive (i.e., there
are none queuing), very-low-pri doesn't quite fit the bill.

> Scheduler: Pause button desirable
> ---------------------------------
>
>                 Key: HADOOP-6592
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6592
>             Project: Hadoop Common
>          Issue Type: Wish
>            Reporter: Adam Kramer
>
> It would be lovely if, from the jobtracker page, I could click a button that's not "kill"
or "fail" but ..."pause."
> The pause button would stop a certain task from starting any more mappers or reducers.
They would all wait in the "pending" stage until the job is "un-paused." Currently-running
tasks would continue to run, and then complete, thus freeing the resources for other jobs.
> This would help a lot for systems (esp. Hive) in which one or two jobs are hogging a
lot of mappers or reducers. The ones they have would finish, and then other jobs could "catch
up," and then they could be unpaused for a while. This would also allow for user-level throttling
of their jobs in instances where they need a lot of resources but have the time to spare.

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